#pragma once
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

typedef struct CycleDoubleNode
{
	int data;
	struct CycleDoubleNode* pre;
	struct CycleDoubleNode* next;
}CDN;

typedef CDN* ptr;

void printList(ptr dh);

ptr initList();
